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Synthesis of LiNi 0.5 Mn 1.5 O 4 Hollow Microspheres and Their Lithium‐Storage Properties
Author(s) -
Luo Haifeng,
Nie Ping,
Shen Laifa,
Li Hongshen,
Deng Haifu,
Zhu Yaoyao,
Zhang Xiaogang
Publication year - 2015
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201402256
Subject(s) - electrochemistry , materials science , lithium (medication) , scanning electron microscope , porosity , electrode , chemical engineering , nanometre , microsphere , diffraction , chemistry , composite material , physics , optics , medicine , engineering , endocrinology
Abstract High‐voltage LiNi 0.5 Mn 1.5 O 4 hollow microspheres have been synthesized through a facile solid‐state method. X‐ray diffraction and scanning electron microscopy results reveal that the as‐prepared LiNi 0.5 Mn 1.5 O 4 microspheres are constructed with nanometer‐sized primary particles. The effects of the precursors on the morphologies and electrochemical properties of LiNi 0.5 Mn 1.5 O 4 materials are systematically investigated. Electrochemical test results demonstrate that the materials with large porosity and smaller second particles exhibit higher reversible capacity as well as better cycle stability and rate capacities. LiNi 0.5 Mn 1.5 O 4 prepared from MnCO 3 precursors delivers high reversible capacities of 135.5, 147.5, and 132.1 mAh g −1 at 0.1, 0.5, and 2 C, respectively. Even at a high rate of 5 C, the electrode retains 93.4 % of the initial capacity at 0.1 C. Moreover, the electrode shows excellent cycle stability with a discharge capacity of 110 mAh g −1 at 1 C after 80 cycles at elevated temperature. The extremely attractive electrochemical properties are closely related to the unique structure and chemistry of the synthesized material.